[Cleanup] Remove leftover debug console logs from web app

[Ashvin-KS]

Description

The web app contains leftover debug console.log calls in production-facing frontend files.

Locations

Examples found during grep:

• web-app/js/main.js:718 - sidebar observer setup log
• web-app/js/main.js:728 - sidebar active/scroll state log
• web-app/js/main.js:1446 - [DEBUG] recentProjects array
• web-app/js/main.js:1462 - [DEBUG] added recently viewed card
• web-app/index.html:1315, 1347, 1353, 1430, 1449, 1465, 1483 - theme/favorites/focus debug logs

Impact

• Clutters browser console for users
• Makes real runtime errors harder to notice
• Leaves internal debug information in production-facing code

Suggested fix

Remove non-essential debug logs while keeping intentional error handling or user-facing behavior unchanged.

Checklist

• I am a registered GSSoC 2026 contributor
• I checked for similar existing issues before creating this

[github-actions]

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